Dynamo-electric machine.



J. E. NOEGGERATH.

DYNAMO ELECTRIC MACHINE.

'APPLIOATION FILED SEPT.23,1909.

9883771 I Patented Apr. 4, 1911.

E 2 SHEETS-S EET 1.

W/tflasss: 071 627 10/";

-' 1 1 J/mb .5. We a emf/7,

J. E. NOEGGERATH.

DYNAMO ELECTRIC MACHINE.

APPLICATION FILED SEPT.23, 1909.

Patented Apr. 4

2 SHEETSSHEET 2.

UNITED STATES rarer-tr clarion.

JAKQB E. NOEGGERATH, OF SCH'ENECTADY, NEW YOBbK, ASSIGNOR T0 GENERAL ELECTRIC COMPANY, A CORPQRATION OF NEW YORK. I

Specification of Letters Patent.

Patented la. a, item.

, application filed. SeptemberQS, i909. SeriaINo. 519,275.

My invention relates to'dynamo electricmachinesof the unipolar type, and its object is to provide a machine of novel design having the advantages of a very open construction, permitting efficient cooling and affording free access to all parts, and of a small magnetic pull in the direction of the axis.

My invention, which is particularly ap- I plicable to machines of low. voltage and high current capacity, will best be understood by reference to the accompanying drawings in which- Figure 1 shows a side elevation, partly in cross-section of a machine constructed in accordance with my invention, and Fig. 2

neath and adjacent to the overhanging flanges of the armature whereby a small cylindrical air gap is formed between said a frame members and said flanges. These cylindrical members are supported by members D D which also carry the bearings b b for the shaft. These members D D, with the bed plate E on which they rest, form a magnetic connection between the two cylindrical members C C. F F represent circumferentially extending field coils surrounding the members C C. These coils. produceamagnetization of the machine along its axis, the" flux passing from one member G radially outward into one overhanging flange of the armature, across the peripheral portion of the armature, radially inward from the other overhanging flange into the other member C, and then back through the members D and the bedplate E to the other member A voltage is therefore induced in the-armature in rotation between its periphery and the shaft. Collector rings G are placed on the periphery of the armature and are engaged by brushes H, while other sets of collector rings G are placed. on one or both ends of the armature shaft outside of the members C. Brushes H engage the collector rings Gr; The brushes H form one terminal of the machine and the brushes H the other.

Slnce the magnetic circuit of the field structure lies on one side only of the arma ture, the armature, field coils, collector rings, and brushes, are all left open and exposed so that efficient ventilation is obtained and all parts are readily accessible. Furthermore because. ofthe design of the magnetic circuit, no unbalanced magnetic pull of any magnitude in an axial direction can exist.

I do not desire to limit myself to the particular construction and arrangement of parts shown and described, but aim in the appended claims to cover all modifications which are within the scope of my invention.

What I claim as new and desire to secure by Letters Patent of the United States is:

1. In a unipolar dynamo-electric machine an-armature comprising a central disk or drical air gap is formed between said frame members and said flanges, 'circumferentially extending field coils surrounding said mem bers, and a field support or bed plate magnetically connecting said members on one side only of said armature so that said. armature and field coils are open and exposed. 2.,lln a unipolardynamo-electric machine,

van armature comprising a central disk or spider and an overhanging peripheral portion with axially extending flanges on oppo site sides of said disk or spider, cylindrical field frame members surrounding the armature shaft and extendingbeneath and adjacent to said flanges whereby a small cylindrical air gap is formed between said frame members and said flanges, circumferentially extending field coils surrounding said members, a field support or bed plate magnetically connecting said members on one side only of said armature so that said arma ture and field coils are open and exposed, and collector rings carried on the periphery of said armature.

. 3. In a unipolar dynamo-electric machine, an armature comprising a central disk or spider and an overhanging peripheral portion With axially extending flanges on oppo site sides of said disk or spider, cylindrical field frame members surrounding the armature shaft and extending beneath and adjacent to said flanges, circumferentially extending field coils surrounding said members, a field support or bed plate magnetically connecting said members on one side only of said armature so that said armature and field coils are open and exposed, collector rings carried on the periphery of said armature, and other collector rings carried 15 on both ends of the armature shaft outside of said members.

In Witness whereof, I have hereunto set my hand this 17th day of September, 1909.

JAKOB E. NOEGGERATH.

Witnesses:

BENJAMIN B. HULL, EMMA B. Coons. 

